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Standard deviation is a calculation of the distribution of different data points in a data set. Put more simply, standard deviation shows how far apart different numbers are from the mean (or average) of the entire group of data; it shows the observer... More »
Difficulty: Easy
Source: www.ehow.com

en.wikipedia.org/wiki/Standard_deviation

In statistics, the standard deviation is a measure that is used to quantify the amount of variation or dispersion of a set of data values. A low standard deviation  ...

www.mathsisfun.com/data/standard-deviation.html

The Standard Deviation is a measure of how spread out numbers are. Its symbol is σ (the greek letter sigma). The formula is easy: it is the square root of the ...

Interestingly, in the real world no statistician would ever calculate standard deviation by hand. The calculations involved are somewhat complex, and the risk of ...

www.calculator.net/standard-deviation-calculator.html

Free online tool to calculate the standard deviation, variance, mean, sum, and confidence range for given numbers. Also find hundreds of other free online ...

www.robertniles.com/stats/stdev.shtml

A simpler explanation of standard deviation, written by a former math-major- turned-journalist who likes to explain math to people don't understand or just plain ...

www.investopedia.com/terms/s/standarddeviation.asp

Standard deviation is a measure of the dispersion of a set of data from its mean. It is calculated as the square root of variance by determining the variation ...

mathworld.wolfram.com/StandardDeviation.html

Physical scientists often use the term root-mean-square as a synonym for standard deviation when they refer to the square root of the mean squared deviation of ...

www.statisticshowto.com/probability-and-statistics/standard-deviation

Standard deviation explained in plain English. How to find it by hand or using technology. Standard deviation symbol. Step by step examples.